The Horde Application Framework is a modular, general-purpose Web application framework. It provides an extensive array of classes that are targeted at the common problems and tasks involved in developing modern Web applications.

Nag is a Web-based application built upon the Horde Application Framework that provides a simple, clean interface for managing online task lists (i.e. TODO lists). It includes strong integration with the other Horde applications and offers shared task lists.

Ingo is an email-filter management application. It
is fully internationalized, integrated with Horde
and the IMP Webmail client, and supports both
server-side (Sieve, procmail, maildrop) and client-side
(IMAP) rule creation.

phpMyAdmin is a tool intended to handle the
administration of MySQL over the Web. It can
create, rename, and drop databases,
create/drop/alter tables, delete/edit/add fields,
execute any SQL statement, manage keys on fields,
create dumps of tables and databases,
export/import CSV data, and administrate one
single database and multiple MySQL servers.

The SeaMonkey project is a community effort to develop an all-in-one Internet application suite. It contains an Internet browser, email and newsgroup client with an included Web feed reader, HTML editor, IRC chat, and Web development tools, and is sure to appeal to advanced users, Web developers, and corporate users. It uses much of the Mozilla source code powering such successful siblings as Firefox, Thunderbird, Camino, Sunbird, and Miro.

phpMyFAQ is a multilingual, completely
database-driven FAQ system. It support various
database systems and it also offers a content
management system with a WYSIWYG editor, an image manager, flexible multi-group and multi-user support, a news system, user tracking, language modules, templates, PDF support, a backup system, Active Directory support, and an easy to use installation script.

Thunderbird is a total redesign of the
Mozilla mail component to produce a
cross-platform, stand-alone mail application using
the XUL user interface language. It has many new
features, among them the ability to customize
your toolbars the way you want them. a new look
and feel with a large number of downloadable
themes which alter the appearance of the client,
and the ability to add UI extensions.

Eric is a full featured Python and Ruby editor and IDE, written in Python. It is based on the cross platform Qt GUI toolkit, integrating the highly flexible Scintilla editor control. It is designed to be usable as an everyday quick and dirty editor as well as being usable as a professional project management tool, integrating many advanced features that Python offers the professional coder. Eric includes a plug-in system, which allows easy extension of the IDE functionality with plug-ins downloadable from the net. Current stable versions are Eric4 based on Qt4 and Python 2 and Eric5 based on Python 3 and Qt4.